Lubricated rotary compressor having a cooling medium inlet to the delivery port

Abstract

A rotary compressor such as a screw-type or a spiral compressor comprises a compressor stator and one or more rotary compression elements, which compressor stator is provided with a suction port, a delivery port and a lubricant inlet, the lubricant being intended for lubricating each compression element, for sealing the gaps between the individual compression elements and between the compression elements and the compressor stator, and for cooling the medium to be compressed during the compression process. The compressor also comprises an inlet for a cooling medium for cooling the lubricant which opens out near or in the delivery port.

I claim: 
     
       1. Rotary compressor comprising a compressor stator and one or more rotary compression element, said compressor stator having an end wall, a suction port, a delivery port situated in said stator end wall, and a lubricant inlet, the lubricant being intended for lubricating each compression element, for sealing the gaps between the individual compression elements and between the compression elements and the compression stator, and for cooling the medium to be compressed during a compression process, a device for cooling the lubricant by injecting a cooling medium, said device for cooling the lubricant having a cooling medium inlet contained in the compressor stator end wall and running in a plane at right angles to the axis of rotation of the compressor elements in such a way that the cooling medium inlet opens out laterally in the delivery port next to an end face of each compressor element which faces said stator end wall. 
     
     
       2. Rotary compressor according to claim 1, wherein said compressor stator includes a gas-tight outer shell and an inner double cylindrical housing having a housing end wall, said housing end wall having at least one bore opening out in the delivery port. 
     
     
       3. Rotary compressor according to claim 2, wherein the outer shell has at least one pipe opening out on its outside and connected to the bore. 
     
     
       4. Rotary compressor according to claim 3, wherein the cooling medium inlet has a flexible part between the outer shell and the housing for absorbing expansion differences. 
     
     
       5. Rotary compressor comprising a compressor stator and one or more rotary compression element, said compressor stator including a gas-tight outer shell and an inner double cylindrical housing having an end wall, a suction port, a delivery port situated in said end wall, and a lubricant inlet, the lubricant being intended for lubricating each compression element, for sealing the gaps between the individual compression elements and between the compression elements and the compression stator, and for cooling the medium to be compressed during a compression process, said housing having three bores opening out in the delivery port for feeding a cooling medium for cooling the lubricant, said three bores being distributed regularly at an angle of essentially 90° over half of the housing end wall facing away from the delivery port opening out laterally in the housing end wall.